Step 4. Fine-Tuning the Filter Parameters

Now we've got the necessary filter and can figure out the parameters required for the modification. For the start let's try the factory presets (on the Presets tab) – double-click a preset thumbnail. One of them is acceptable but can be fine-tuned. Click the Settings tab and start experimenting with the sliders.

One thing can be of great help: the 'Next variant' button in the Randomizer section. You can simply click it until you get sufficient results. The following variant seems to be close to perfect:

Step 5. Looking for Imperfections

Look thoroughly at the result. The dirty blotches near the boat reflection spoil the picture. Some extra correction is needed.

Step 6. Masking Places that Need Fixing

Undo the last action (Ctrl+Z) and start the color correction. Switch to the Quick Mask mode (Q) and use Soft Round brush to paint the areas that are meant to be preserved – everything except the water.

Step 7. Fixing the Water with Masked Levels

Switch to the Standard Mode (Q) and invert the image: Select > Inverse (Ctrl+Shift+I). Go to Image>Adjustments>Levels and drag the slider until you get the detail that looks good to you.

Step 8. Sharpening the Water

For better results sharpen the water areas using the Sharpen Tool (R) with large diameter and soft edges.

Step 9. Final Filtering

Launch the Filter Forge plugin and apply the Watercolor Painting again. Here is the final result:

“Filter Forge is an incredibly powerful new Photoshop Plugin. It's simply amazing. It gives you the power to create your own filters (you must run them from inside Filter Forge though) without any programming knowledge at all.”